Keep my 3.55 or change to 3.15

[James_GT]

With 900 HP I'd say the 3.15s would be your choice. Especially on the street. At the track you'd have to be concerned about the trans going to 7th gear.

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[SolarFlare]

It will take a LOT of power to exceed 143 mph in the quarter. If you are comfortable with 7800 RPM shift points, you may not need 7th.

Yea, like 750whp. lol

or less if car if mustang is very light and you're blessed with -1000 or higher DA.

 

[brucelinc]

Yea, like 750whp. lol

or less if car if mustang is very light and you're blessed with -1000 or higher DA.

I will look forward to seeing the OPs car run. A 945 WHP GT 500 barely does it.

 

[SolarFlare]

I will look forward to seeing the OPs car run. A 945 WHP GT 500 barely does it.

Irrelevant comparison as Shelbys just came put, tuning is still in development, no trans tuning and weights 4200lbs + driver

See sig. 143.5mph

 

[brucelinc]

Irrelevant comparison as Shelbys just came put, tuning is still in development, no trans tuning and weights 4200lbs + driver

You just like to argue, don't you? So, smart guy, tell me all about the OPs car. It may well be an all out race car with 900 HP and hopefully he will share his mods and dyno sheets but my point is valid.

 

[Bluemustang]

Let me know if you let go of that 3.55 pumpkin. I might have a guy willing to buy it from you ;)

 

[SolarFlare]

You just like to argue, don't you? So, smart guy, tell me all about the OPs car. It may well be an all out race car with 900 HP and hopefully he will share his mods and dyno sheets but my point is valid.

Who’s arguing?? I’m not. I simply stated a fact. But if you consider 750 A LOT of power then that’s fine.

My buddies Paxton at around 730whp 10r80 went 140 in 95* weather, about 3000 DA on pump gas with Octanium. PBD tuned.

 

[brucelinc]

Who’s arguing?? I’m not. I simply stated a fact. But if you consider 750 A LOT of power then that’s fine.

My buddies Paxton at around 730whp 10r80 went 140 in 95* weather, about 3000 DA on pump gas with Octanium. PBD tuned.

LOL...what I am trying politely to say is that we don't know much about the OPs car other than it is a 2019 401a PP car with a Whipple. He says it makes 900 HP. I have no reason not to believe him. However, I don't know what he has done to the car, if his HP number is a guess or reality. Most of the guys with Whipples and basic tunes run more in the 130 range at my tracks. One of the guys on this forum with a PBD tuned Whipple recently ran around 131 at Atco in very good air. Of course, the OP may have a lot more tweaks than that.

If I recall from some of your posts, you have run around 140 or so in the quarter. You must be making some pretty decent power yourself!

 

[80FoxCoupe]

LOL...what I am trying politely to say is that we don't know much about the OPs car other than it is a 2019 401a PP car with a Whipple. He says it makes 900 HP. I have no reason not to believe him. However, I don't know what he has done to the car, if his HP number is a guess or reality. Most of the guys with Whipples and basic tunes run more in the 130 range at my tracks. One of the guys on this forum with a PBD tuned Whipple recently ran around 131 at Atco in very good air. Of course, the OP may have a lot more tweaks than that.

If I recall from some of your posts, you have run around 140 or so in the quarter. You must be making some pretty decent power yourself!

When I was on pump 93 making 700whp, trapped 141. Now making just at 900whp, traps 150. If OP is making 900, 150 trap shouldn't be an issue.

 

[SolarFlare]

LOL...what I am trying politely to say is that we don't know much about the OPs car other than it is a 2019 401a PP car with a Whipple. He says it makes 900 HP. I have no reason not to believe him. However, I don't know what he has done to the car, if his HP number is a guess or reality. Most of the guys with Whipples and basic tunes run more in the 130 range at my tracks. One of the guys on this forum with a PBD tuned Whipple recently ran around 131 at Atco in very good air. Of course, the OP may have a lot more tweaks than that.

If I recall from some of your posts, you have run around 140 or so in the quarter. You must be making some pretty decent power yourself!

If for whatever reason he’s lying then yea that’s another story. But 900whp on a 10r80 with a 17” tire is plenty for low 140s and therefore it will be going into its 1:1 which has I hear a lot of people say that the stock 10r80 doesn’t like. So for initial testing is fine, but id start throwing offers for a pumpkin swap.

I went 9.69 at 143.5 at +1100DA. Made right at 750whp thru a 6R80

 

[brucelinc]

Yeah, I don't want to accuse anyone of lying without evidence. I agree that a shift to 7th with a 900 hp 10r80 would not be good.

 

[80FoxCoupe]

315/331 is what most run to stay out of 7th

 

[ugstang17]

Until you see what it does at the track you can speculate until the cows come home. Wait until the track opens, make some passes and then see. Calculators and speculation make for great conversation, but the proof is in the pudding. Data log the passes, review the time slips and then rather than blind speculation you can make a somewhat informed decision in data, time slips, and with the rubber meeting the road. Why bother wasting your time making a change blindly?

 

[brucelinc]

Excellent advice, ugstang17.

 

[Mustang Mods]

900 hp will go close to 150mph. Do 3.31 and be done. Even with upgraded clutches you don't want a shift into 7th. The stock 10r80 will be done very quickly above 750 you will 100% need clutches.
We try not to dyno in 7th even on upgraded trans because it does not like it.

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